I have two partners with whom, in the context of a system based more on Acol than Std Am, we have the agreement that responder's reverses are only forcing for one round. It has the advantage that we can bid our suits in the natural order with a 4153 11-count for example. It has the disadvantage that having done so, opener now needs to blast to game with a 14-count, rather than just raising. Which has the further effect that you can't improvise by rebidding a strong three-card suit. In a strong-NT context, you need responder's reverses to be forcing to game because opener might rebid 2NT with a minimum hand concealing a four-card major. In a weak-NT context, if opener rebids 2NT concealing a four-card major, the hand will be strong.